Fifth-seeded Ana Ivanovic struggled with her serve and lost in three sets to Czech qualifier Lucie Hradecka in first big upset of the Australian Open on Monday, Ivanovic's worst result in a major since 2011.

The Czech Republic claimed its third Fed Cup title in four years after Wimbledon champion Petra Kvitova had to fight hard to overcome Angelique Kerber of Germany in the opening reverse singles match on Sunday.